docs: def find_id(self, element_id):
          """Find element by its id.
  
          Parameters
          ----------
          element_id : str
              ID of the element to find
  
          Returns
          -------
          FigureElement
              one of the children element with the given ID."""
          find = etree.XPath("//*[@id=$id]")
          return FigureElement(find(self.root, id=element_id)[0])